Estimation of Elastic Constants from Surface Acoustic Wave Velocity by Inverse Analysis using the Downhill Simplex Method

1998 ◽  
Vol 37 (Part 1, No. 5B) ◽  
pp. 3116-3119 ◽  
Author(s):  
Harumichi Sato ◽  
Hideo Nishino ◽  
Hideo Cho ◽  
Hisato Ogiso ◽  
Kazushi Yamanaka
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Wave Velocity ◽  
Elastic Constants ◽  
Simplex Method ◽  
Inverse Analysis ◽  
Acoustic Wave Velocity ◽  
Downhill Simplex Method ◽  
Downhill Simplex

scholarly journals Brillouin scattering determination of the surface acoustic wave velocity in InxGa1−xN: A probe into the elastic constants

2012 ◽  
Vol 101 (6) ◽  
pp. 062103 ◽  
Author(s):  
R. J. Jiménez-Riobóo ◽  
R. Cuscó ◽  
R. Oliva ◽  
N. Domènech-Amador ◽  
C. Prieto ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Wave Velocity ◽  
Elastic Constants ◽  
Brillouin Scattering ◽  
Acoustic Wave Velocity

scholarly journals Surface acoustic wave velocity and elastic constants of cubic GaN

2016 ◽  
Vol 9 (6) ◽  
pp. 061001 ◽  
Author(s):  
Rafael J. Jiménez Riobóo ◽  
Ramon Cuscó ◽  
Carlos Prieto ◽  
Caroline Kopittke ◽  
Sergei V. Novikov ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Wave Velocity ◽  
Elastic Constants ◽  
Acoustic Wave Velocity ◽  
Cubic Gan

Derivation of seismic cone interval velocities utilizing forward modeling and the downhill simplex method

2002 ◽  
Vol 39 (5) ◽  
pp. 1181-1192 ◽  
Author(s):  
Erick J Baziw
Keyword(s):  
Elastic Constants ◽  
Simplex Method ◽  
Forward Modeling ◽  
S Wave ◽  
Cone Penetration ◽  
Interval Velocity ◽  
Wave Velocities ◽  
Downhill Simplex Method ◽  
Downhill Simplex ◽  
Interval Velocities

The seismic cone penetration test (SCPT) has proven to be a very valuable geotechnical tool in facilitating the determination of low strain (<10–4%) in situ compression (P) and shear (S) wave velocities. The P- and S-wave velocities are directly related to the soil elastic constants of Poisson's ratio, shear modulus, bulk modulus, and Young's modulus. The accurate determination of P- and S-wave velocities from the recorded seismic cone time series is of paramount importance to the evaluation of reliable elastic constants. Furthermore, since the shear and compression wave velocities are squared in deriving the elastic constants, small variations in the estimated velocities can cause appreciable errors. The standard techniques implemented in deriving SCPT interval velocities rely upon obtaining reference P- and S-wave arrival times as the probe is advanced into the soil profile. By assuming a straight ray travel path from the source to the SCPT seismic receiver and calculating the relative reference arrival time differences, interval SCPT velocities are obtained. The forward modeling – downhill simplex method (FMDSM) outlined in this paper offers distinct advantages over conventional SCPT velocity profile estimation methods. Some of these advantages consist of the allowance of ray path refraction, greater sophistication in interval velocity determination, incorporation of measurement weights, and meaningful interval velocity accuracy estimators.Key words: seismic cone penetration testing (SCPT), downhill simplex method (DSM), forward modeling, Fermat's principle, weighted least squares (l2 norm), cost function.

Temperature dependence of surface acoustic wave velocity in thin metal films

1991 ◽  
Vol 202 (1) ◽  
pp. 171-179 ◽  
Author(s):  
Shu-Yi Zhang ◽  
Liang Guo ◽  
An Hu ◽  
Qiu-Shi Gao ◽  
Zhong-Nan Lu
Keyword(s):  
Acoustic Wave ◽  
Temperature Dependence ◽  
Surface Acoustic Wave ◽  
Wave Velocity ◽  
Metal Films ◽  
Thin Metal ◽  
Thin Metal Films ◽  
Acoustic Wave Velocity

Effect of metallisation on surface acoustic wave velocity in GaN-on-sapphire structures

2000 ◽  
Vol 36 (6) ◽  
pp. 591 ◽  
Author(s):  
D. Čiplys ◽  
R. Rimeika ◽  
R. Gaska ◽  
M.S. Shur ◽  
A. Khan ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Wave Velocity ◽  
Acoustic Wave Velocity

Factors Influencing the Variation of Surface Acoustic Wave Velocity in Lithium Tetraborate

1997 ◽  
Vol 36 (Part 1, No. 5B) ◽  
pp. 3074-3075 ◽  
Author(s):  
Vincent Vezin ◽  
Shinichiro Inui ◽  
Kunio Yamaguchi ◽  
Tamotsu Sugawara ◽  
Ryuichi Komatsu ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Wave Velocity ◽  
Lithium Tetraborate ◽  
Acoustic Wave Velocity ◽  
Factors Influencing
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